中文摘要：

提出了一种改进的基于动态量化小波系数的鲁棒水印算法.水印通过动态量化嵌入到载体图像小波变换的高频子带上,混沌优化用于搜索嵌入水印的最大可用块数,中国剩余定理用于安全地产生动态量化参数.该算法和Lin等人提出的数字水印方案相比,不仅具有良好的隐蔽性、安全性和不可感知性,同时,算法也具有良好的抗压缩攻击等鲁棒性能.仿真结果验证了算法的有效性.

英文摘要：

An improved robust watermarking scheme based on wavelet coefficient dynamical quantization is proposed in this paper,and the watermarking is dynamically embedded by modifying the coefficients of high-frequency sub-band LH3.Chaos is used to optimize usable blocks for watermarking embedding,and Chinese Remainder Theorem（CRT） is used to produce quantization parameters,which guarantees the security of the scheme.Compared with the watermarking method proposed by Wei-Hung Lin,the proposed scheme has the advantages of concealment,security and imperceptibility in the meantime,it has strong robustness against image compression.The experimental results show the effectiveness of the scheme.